TA#77476 [14.0][DOC] stock_serial_single_quant : document security group configuration

[qtiplb]

Summary

• Added documentation for the new security group that controls access to the bypass serial constraints configuration
• Reorganized the Configuration section with two subsections: Security Group and Bypass by Warehouse
• Explained how to grant users permission to configure the bypass option

Test plan

• Review the updated README.rst for clarity and completeness
• Verify that the documentation accurately reflects the implemented security group functionality

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
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TIP This summary will be updated as you push new changes.}